Q1 of 53 Page 201

Define average speed, write any one point of difference between average speed and average velocity.

Average speed of the object in an interval of time is the distance travelled by the object divided by the duration of interval of time. Average speed is a scalar quantity while average velocity is a vector quantity.


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4

In which one of the following cases will the distance covered and the magnitude of the displacement are not the same? Justify.

(i) A passenger in a train travels from Delhi to Kolkata.


(ii) A raindrop falling in still air.


(iii) An athlete completes one lap in a race.

 5

After studying the motion of a ball rolling on a straight line as shown in the figure.


Find its distance and displacement covered.


(i) when it rolls from P to Q and then to R (i.e., P to Q to R)


(ii) Finally comes back to P (i.e., P to P)(take, P as reference point).

 2

The maximum speed of a train is 80 km/h. It takes 10 h to cover a distance of 400 km. Find the ratio of its maximum speed to its average speed.

 3

Which of the two can be zero under certain conditions: average speed of a moving body or average velocity of a moving body?